<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <link rel="stylesheet" href="../src/xr-ui.css" />
  <title>页面布局</title>
</head>
<body>
     <div class="xr-header">
          标题栏
     </div>
     <div class="xr-navbar">
         导航栏
     </div>
     <div class="xr-content">
         内容区域
     </div>
     <!-- 页面蒙版 -->
     <div class="xr-mask"></div>
</body>
</html>